MY Z31 300ZX Crank Angle Sensor Upgrade/Replacement

[@ronskopitz2360]

THANK YOU for actually stating what part you used!!! There are about a dozen videos on YT showing how to replace the Z31 CAS, but yours is the only one that actually lists what freakin’ part was used. Much appreciated!!

[@MyZ31300ZX]

Glad my video was of some help to you.

[@nissan_200zr3]

Great video!!! I will definitely be asking you some questions in the near future. I just picked up an 84 Datsun 300zx Turbo. Cant wait to start the project

[@MyZ31300ZX]

PERSEUS240 Thanks. Ask away and I will try and respond as soon as I can.

[@bobluhrs]

Very thorough, nice job.

[@MyZ31300ZX]

Thank you.

[@randybruno5057]

Would like to see more videos of these I like the edit style

[@MyZ31300ZX]

randy bruno there are several more in the works. Have patience they will come.

[@landonwells7610]

Awesome video super helpful thanks

[@donovandaga8176]

Helpful vid .You should do one on changing the automatic transmission fluid . Dropping the pan etc. if you can .

[@MyZ31300ZX]

Don Daga I would have to locate a friend with an automatic. Mine are all manuals.

[@jdmlegends3009]

Where can I find the CAS upgrade part? The website that used to have them is closed and I can't seem to locate them anywhere else. I don't want to get another Walker CAS too.

[@MyZ31300ZX]

They have since been difficult to find. Nissan use to carry them but not anymore.

[@kataysmith9581]

Great thanks

[@MyZ31300ZX]

Katay smith , any time. 😁

[@KustomWorkshop1980]

Emailed you hope that one still works. Trying to figure this out

[@MyZ31300ZX]

Should still work.

[@KustomWorkshop1980]

@@MyZ31300ZX ok i sent you an email please answer when you have a moment

[@MyZ31300ZX]

Phil Prutton , I have yet to receive it. I will check spam folder etc. to try and locate.

[@MyZ31300ZX]

Phil Prutton , try emailing [e-mail]

[@Dookieandsons]

My car used to fire right up when I hit the key when it was cold outside hot outside it didn't matter well when I did the upper intake delete and deleted the cold start it still started up perfect in the summer time but in the winter it was a little cold natured well now I've noticed over the past month or two it seems like it's a little extra cold-natured like it's a little longer to start and then like you said it it doesn't run very decent when it first starts it doesn't want to let me give it much gas but after it warms up is gone and I really used to think I had a miscarriage a slight little misfire but I began to think that's just have those cars ran because my 87 did the same thing but I thought it ran good but it had like a slight stutter is what I called it not quite even a misfire more like a slight stutter now that I just listened to this video while I was working I had to rewind it and watch it again and pay attention and I think this might be my issue right now because it runs good once it warms up but it just takes a little longer to start than it used to I almost want to make a video of a cold start when I get home and send to you just to see what you think I'm almost embarrassed to put it on my KZbin channel for the cold start LOL

[@MyZ31300ZX]

The symptoms you describe sound like the CHTS. Have you checked for any diagnostic trouble codes?

[@Dookieandsons]

It's been awhile since I messed with Those sensors but is the chts the one on the driver side with the yellow wire coming out or is it the one on the passenger side the one on the driver side is not even hooked up anymore no my bad the chts is the one right behind the timing cover you can barely get to can you relocate it

[@MyZ31300ZX]

@@Dookieandsons it is the sensor located below the distributor behind the rear timing cover.

[@Dookieandsons]

@@MyZ31300ZX yeah I'm going to relocate that today I'm going to get the Pathfinder c h t s and put it in my intake on the driver side I have actually had that sensor pulled out before in the intake when I was trying to hook up a temp sensor aftermarket gauge but I wound up doing it differently so the sensor in the top of the intake the wire is cut and I haven't been using it in about 6 months but I'm going to relocate it with the Pathfinder one in that location today if I can find a new sub harness but I was wondering when I do this relocation can I cut that factory wire so I can pull it out from the timing cover and get it out of the way by the way have u seen my z31

[@MyZ31300ZX]

@@Dookieandsons Sure if you get a new sub harness you can cut the old one out. Just unplug it from main harness first.

[@jameslivesay1007]

i haave a 86 non turbo it will start and run for just a sec or to and then die it has new fuel pump and pressure. also pulled injectors cleaned and tested and rebuilt them also has fuel injector pulse, also has spark. i can spray starting fluid in it and it will somewhat run also replaced distributor cap and rotor button seems like something is shuting the fuel off but it keeps pressure hope you can help thing is about to piss me off lmao . well it already has .

[@MyZ31300ZX]

Have you checked for DTCs? What is fuel pressure after the filter?

[@jameslivesay1007]

@@MyZ31300ZX I’m lost on that one what is it and how do I check

[@jameslivesay1007]

@@MyZ31300ZX the fuel pressure is about 45 50 pounds

[@jameslivesay1007]

@@MyZ31300ZX codes yes 21 is one

[@MyZ31300ZX]

@@jameslivesay1007 That is excessively high, Should be 37psi with key on engine off.

[@dlgump]

Quick question, the wire connector that shoots out to behind the distributor, does itnplug in on the opposite side of the intake?

[@MyZ31300ZX]

Dennis Gump ,yes.

[@js-rf9le]

I've got a 1991 Nissan d21 V6 and this is the exact same set up. It's throwing code 11 (which is this sensor or that's what I get out of it) so I changed the sponsor just like you did in the video but it still won't crank. I've changed the distributor cap, rotor, and ignition coil also. I'm stuck and don't know what do do next if anyone has info or could help please give me some pointers. Thanks!

[@MyZ31300ZX]

Test the ignitor.

[@js-rf9le]

@@MyZ31300ZX I tested it. I have power all the way to the distributor. The distributor rotor is not spinning when I turn it over could that mean the whole distributor unit need to be changed or the timing belt is broke off or worn?

[@MyZ31300ZX]

@@js-rf9le inspect timing belt and driver timing gear.

[@yourleaderslie]

Great videos, love the editing too! I have a 86 300zx. Trying to figure out what the sensor is front drivers side, one tan wire going to it. If standing in front of the car it is at 10 o'clock from the distributor. Any help would be appreciated!!

[@MyZ31300ZX]

yourleaderslie email me a picture and I will identify it for you.

[@yourleaderslie]

Ok thanks, whats the email address? It looks like a mouse chewed up the wire going to it...

[@MyZ31300ZX]

yourleaderslie [e-mail]

[@mikecorleone6797]

Probably fuel temp switch lol has a single wire going to it on the fuel rail?

[@billybobby769]

I own a 84 turbo' warms up then cuts out. will crank 'but won't start.will this fix the proplem?thx.

[@MyZ31300ZX]

billybobby769 If the cas is failing yes. Check the DTC first. I've also seen a key switch get hot and do the same thing as you describe.

[@billybobby769]

thks for responding mate. can it [the switch] be repaired or must I replace it[ $300.00].im in Canada lol hense the price thks again.

[@seanh5014]

I have no spark on my 88 200sx se. Is this likely my problem. The distributor cap was left loose while the car sat for 2 years so there was tons of moisture and corrosion!

[@MyZ31300ZX]

Sean H it’s a good possibility. The CAS tells the ecu when to fire off the coil.

[@seanh5014]

So do you have a good source for a cas

[@MyZ31300ZX]

Sean H I ordered one online.

[@Loebane]

I thought I had a bad CAS. Turns out I just needed to clean and tighten up the connectors a bit. So, what's better about the 240sx CAS?

[@MyZ31300ZX]

Loebane Newer updated technology. Less prone to failure.

[@Loebane]

Gotcha.

[@Loebane]

Haha turns out I was wrong - it WAS the CAS. I replaced it with the one you got, and now I'm running great on Megasquirt.

[@MyZ31300ZX]

Loebane awesome! Glad you were able to resolve the problem.

[@billybobby769]

thankyou, I have a low idle 600rpm turned out idle screw no real change. egr valve maybe?>

[@MyZ31300ZX]

billybobby769 needs to turn in to raise idle.

[@billybobby769]

no start problem resolved change ignition modual on fender too a prw-2

[@MyZ31300ZX]

Sometimes ignition control modules fail.

[@MyZ31300ZX]

Glad you got it all figured out.

[@GPXironczech]

I've got some questions, I have an 86 300z and it'll start and run but when try to "floor" it it'll bog and also does it when going up a hill. I've changed water pump, timing belt, thermostat, temperature sensor. Rotor, plugs, wires and cap are fairly new.Trying to get it running good. Any help will be much appreciated

[@MyZ31300ZX]

James R any diagnostic Trouble Codes?

[@GPXironczech]

None showing on dash

[@MyZ31300ZX]

James R the dash will not show any DTCs. Need to access the ecu to get the diagnostic Trouble Codes. XenonZcar.com in the Z31 section has full documentation on how to check the codes. Also has resources such as service manuals and owners manuals. Loads of helpful info there that may help you.

[@billybobby769]

idle screw on ecu is it worth trying,

[@MyZ31300ZX]

billybobby769 adjusting the screw on the ecu won't raise the idle. It's just for diagnostics.

[@michaeljj5321]

So does the 240 cas bolt right up?

[@MyZ31300ZX]

michaelj j , as seen in the video it is a plug and play unit. Fits exactly the same as stock Z31 CAS.

[@red-dragon_akuma6378]

What does this help for? Faster Start ?

[@MyZ31300ZX]

Faster Start and runs smoother.

[@billybobby769]

removed and cleaned tb

[@billybobby769]

low idle issue,cleaned aac,replaced sensor chts , vac hoses replaced,problem only when engine is warm. ths

[@MyZ31300ZX]

billybobby769 check for vacuum leaks and also test Idle air control and auxiliary air control valve.

[@billybobby769]

cleaned maf also

[@billybobby769]

hi, me again,if car cranks key switch is good?

[@MyZ31300ZX]

billybobby769 not necessarily. As the contacts inside get hot they arc and sometimes fail to make good connection.

[@billybobby769]

thks need new key ignition? sry whats dtc?

[@MyZ31300ZX]

billybobby769 DTC is diagnostic trouble codes. Cas can fail at random times. Or completely fail. Any other symptoms that may help with diagnosis?

[@billybobby769]

cant get it too die therefore no codes thks. don't want too drive until proplem fixed.idle's all day. only when I drive it. I remember having radio on while cleaning. after cleaning was completed I went too coffee shop and it died in parking lot. waited 2 hrs then it started and I drove home. 126 thousand miles on her.

[@billybobby769]

adjusted screw on idle ,no results unplugged started car ,tried adjusting pluged back in

[@eirikrhinnraui4098]

You know where to get the 240SX C.A.S. unit itself?

[@MyZ31300ZX]

Can get them from Z31parts.com or Nissan even Rockauto

[@eirikrhinnraui4098]

@@MyZ31300ZX Coolio, thanks my dude.

[@billybobby769]

new tps also

[@GTPWRgarage]

Mine doesn't want to start I have changed the key ignition switch the distributor and crank sensor the ignition coil ignition coil resistor the fusible links then fuel pump The fuel pump relay When I open the key switch it primes and it cranks but no spark no injection and no fuel pressure any advice ?

[@MyZ31300ZX]

XSDGX check for breaks in the harness. Also verify ecu functionality.

[@GTPWRgarage]

I already checked the ecu and the harness haven't found any breaks but I do know my dad sent the ecu to check and they said it was fine , but since we are adding a turbo to it , my dad asked to get the base tune of the turbo into our ecu could that be a problem making it not to start the ecu has a nistune in it

[@MyZ31300ZX]

XSDGX I run a Nistune Ecu. It didn't stop mine from starting. At least with the proper z31 tune. Ecu needs to see cas in order to trigger injectors and coil. Somethings not right if you have no injector pulse or spark. Usually faulty cas will cause this. Or a break in the harness. Test all the way back to the ecu and make sure everything is within specs. What if any DTC does Nistune show?

[@GTPWRgarage]

how do i check any dtc?

[@MyZ31300ZX]

XSDGX plug the USB from the Nistune ecu into laptop. Turn key to on. Run Nistune software. Consult ecu through software. Click on F6 or Display consult gauges. In consult view lower right side says ecu messages. Any DTC will be listed there. If you need help let me know and I'll make a video for you on how.

[@finwall]

hey my z31 you know a good place to find a CAS for a decent amout of money. nissan wants way to much fir one

[@MyZ31300ZX]

eric finwall ASCO sells the updated unit at a decent price. store.acadianasportscars.com/en056-0002

[@finwall]

My Z31 300ZX thanks bud, will look into this one. gonna test my CAS this week. thanks for the help

[@MyZ31300ZX]

eric finwall I also emailed you as well. Feel free to send me an email if you like.

[@mikecorleone6797]

Anywhere i can get the updated cas? Acadiana is sold out..

[@seanh5014]

Website is no longer good. Any other trusted sellers?

[@billybobby769]

after 2 hours will start again and run.

[@XenonZcar]

Will the Owner of this video PM me. I run XenonZcar.com

[@MyZ31300ZX]

PM sent via FB messenger

[@tylereakin1]

I love your forum! I'm brand new to Z ownership and its been such a valuable resource to fix my stuff. Thank you!

[@inthrutheoutdoor3464]

My 1985 z31 non turbo idles fine and runs well above 3k rpm but when 1st accelerating runs rough in lower rpms which causes car to lunge as it accelerates then smooths out and all is fine when you get above about 3k rpms. Any suggestions?

[@Kgio-2112]

The silent type

[@MyZ31300ZX]

k Gio , yessir. Makes it easier to record.

[@billybobby769]

car wants too stall at stop sign

[@MyZ31300ZX]

+Eric Finwall PM me please.

[@billybobby769]

bad negative battery clamp. fixed.yahoo

[@MyZ31300ZX]

billybobby769 nice. Glad you have found the problem.